Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid over time. It is the second-most-used substance (after water), [1] the most widely used …

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This free concrete calculator estimates the amount of concrete necessary for a project and can account for different shapes and quantities.

Concrete is made up of three basic components: water, aggregate and Portland cement. Because concrete is such a durable material, it is used for construction projects of all sizes.

Dec 10, 2025 · Concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is bonded together by …

In its most common form, concrete consists of aggregate (sand and stone), Portland cement, and water. The cement and water create a paste that acts as a binding agent for the aggregates.